One Flesh Union - Christ and the Church

I have posted a version of this question in the Biblical Studies because I believe it is a beautiful question to ponder. And another version in the interdenominational Discussions to see how we view this mystery as expressed in the Sacrament of Matrimony differently.

But I have really been waiting patiently and anxiously for quite a long time to post this particular question on this forum because in another discussion here, the Catholic view of the One Flesh Union between Christ and the Church was called blasphemous. Specifically this teaching from the Catechism.

795 Christ and his Church thus together make up the "whole Christ" (Christus totus). The Church is one with Christ. The saints are acutely aware of this unity:

Let us rejoice then and give thanks that we have become not only Christians, but Christ himself. Do you understand and grasp, brethren, God's grace toward us? Marvel and rejoice: we have become Christ. For if he is the head, we are the members; he and we together are the whole man. . . . The fullness of Christ then is the head and the members. But what does "head and members" mean? Christ and the Church.

Our redeemer has shown himself to be one person with the holy Church whom he has taken to himself.

Head and members form as it were one and the same mystical person.

A reply of St. Joan of Arc to her judges sums up the faith of the holy doctors and the good sense of the believer: "About Jesus Christ and the Church, I simply know they're just one thing, and we shouldn't complicate the matter."

Our understanding of the One Flesh Union between Christ and the Church is based upon this verse.
Ephesians 5:
30For we are members of his body, of his flesh, and of his bones. 31For this cause shall a man leave his father and mother, and shall be joined unto his wife, and they two shall be one flesh. 32This is a great mystery: but I speak concerning Christ and the church.

Now, it seems to me that our understanding lines up pretty well with Scripture.

And so, I posted this particular thread to see how your views contrast with the Catholic view of this greatest and most wonderful of mysteries.

2. Where did you get the understanding that the Catholic Church teaches "they do not have Eternal Life abiding in them"?

Mike refers to a previous post in another place,

re: He who has the Son of God has Eternal Life (Salvation)
Submitted by De Maria on Sun, 2009-11-29 21:38.
Mike says,
So ... following your logic, and assuming that you have kept His commandments as instructed .... do YOU have eternal Life?

DM said,
Why do you want to trick me into exalting myself?
Matthew 23:12
And whosoever shall exalt himself shall be abased; and he that shall humble himself shall be exalted.

There is one judge. I leave the judgement to Him:
Romans 14:10
But why dost thou judge thy brother? or why dost thou set at nought thy brother? for we shall all stand before the judgment seat of Christ.

Mike quotes,

"He who has the Son has life; he who does not have the Son of God does not have life" 1 John 5:12,

DM said,
I leave it to God to judge whether I have the Son or not.

Mike wonders,

If you are't sure whether you have the Son or not, how can you be sure that you have "become Christ" as item 795 seems to declare.

Or have I totally misunderstood your reasoning??

Mike
-----"Divine Grace is not opposed to effort ...
it is opposed to earning "
— Dallas Willard

Mike
-----"Divine Grace is not opposed to effort ...
it is opposed to earning "
— Dallas Willard